Extensible spindle



Nov. 1, 1927,

J. PRoKoP EXTENSIBLE SPINDLE Filed Aug, 4, 1924 Patented Nov. l, 1927.

UNITED STATES PATENT OFFICE.

JGHN PROKOP, OF DETROIT, MICHIGAN, ASSIGNOR OF ONE-HALF TO FRANK V.

ELBERTZ, 0F DETROT, '.VICHIGAN.

EXTENSIBLE SPINDLE.

vApplication. led .August 4, 1924. Serial No. 730,127.

The invention relates to eXtensible spindles adapted for use in adjusting machine tools such as multiple drills and the like and the primary object is to provide a simple adjusting device capable of being used With the standard type of tools.

According to the present practice, it is diflicult to adjust the various drills in a multiple drill press head so that the points lie in a common plane since the drills are often of various lengths due to sharpening, To overcome this difficulty l have provided a device which is capable of being inserted in the socket of the drill head ordinarily receiving the tang of the drill and having a corresponding socket at its opposite end capable of longitudinal adjustment with respect thereto. lWith this device, therefore, it is a simple matter to set the drills at the required length.

ln the drawings Figure l is an elevation of my improved device; v

Figure 2 is a longitudinal section thereof;

Figure 3 is a section on the line 3-3 of Figur-e 1.

As specifically illustrated in the drawings, is a tubular member eXteriorly threaded at B With a right-hand thread and provided with a tapered shank or tang C similar to that found upon the drills or other tools in conjunction with which the device is to be used. D is a. member telescopically engaging the outer tube A and provided With a longitudinal slot D engageable with the spline or key A in the member A. rllhe member D is provided with a tapering socket E, the upper end of which terminates in a transverse slot E for receiving the flattened end F of the drill or other tool F. The opposite end of the member D is exteriorly threaded withv a left-hand thread.

G is the adjusting nut provided with th-e polygonal gripping surface Gr and being interiorly threaded With both right and lefthand threads, the former being of a diameter to engage the threaded end of the tubular member A and the latter, or left-hand threaded portion being of reduced diameter to engage the left-hand threads of the inner member D. Thus, by rotating the adjusting nut G, a relative longitudinal movement is imparted to the inner and outer members D and A, thereby adjusting the distance of the drill F from the tang C ving the tang of the drill.

Y Cone automatic,

In order to lock the device in adjusted position, there is provided a lock nut H having the interior threads H at one end thereof, the lock nutpreferably being counterbored to form the sleeve H2 slidably engaging the cylindrical surface of the member A.

The device as above described forms an adapter which may be inserted in the socket of a drill press or other machine tool and contains a corresponding socket for receiv- Rotation is prevented by means of the spline A While the drill may be longitudinally adjusted by rotating the nut G until the drill is of the proper length, whereuponv the lock nut H may be tightened to maintain the position of adjustment.

It is obvious that the device may be modified from the specific arrangement shown to accomplish the same results and instead of providing rthe right -hand and left -hand threads upon the adjusting member G, the latter may be rotatably secured to either of the telescopic members Whilel having a threaded engagement With the other member. It is preferable that the tang C of the outer member should be complementary to the sock-et E in the inner member since With this arrangement the adapter forms a coupling capable of being-unseated in socket of the ordinary machine and to itself receive the shank of the drill or other tool designed to be inserted in said socket.

rThe device as herein described and illustrated is adapted to be used With a large number of commercial machines such as the Bretan automatic, B & S automatic, Gridley, Cleveland automatic, J t L double spindle boring mills and others. lt may also be used for multiple or gang drilling, tapping and reaming. y

What I claim as my inventiony is l. An adapter for machine tools comprising a pair of telescopically engaging members, a permanent connection between said members preventing relative rotation thereof While permitting relative longitudinal movement, a sleeve of said members, the outer of said members being provided with a tang and the inner' member having a corresponding socket, and means for lockingsaid sleeve in adjusted position.

2. An adapter for machine tools comprising a pair of telescopically engaging memthreadedly engaging both bers, one being provided with a longitudinal slot, a spline upon the other ot' said meinbers engaging said slot, a tang on the outer of said tevl'eseopie members, a socket in the inner o't said members, right-hand threads upon one et said members, left-hand threads upon the other o'f said members, a sleeve interiorljy' threaded to engage both said righthand and said left-hand threads, and a lock nut engaging the threads on one of said members'.

3. An adapter for machine tools oomprising al tubular member having exterior threads at one end thereof, a tang extending :from the opposite end thereof, a second member having` a splined telescopic engagement with said Erst-mentioned member, and provided with exterior threads of theY opposite hand, said member being also provided with a' socket Complementary to the tang on said first-mentioned member, a sleeve having right and left-handed interior threads enthreadedly engaging said outer member anda' reduced portion threadedly engaging` said inner member, and means for lockingv said sleeve in adjusted position.

In testimony Whereolz I atiix my signature.

JOHN PROKOP. 

